I'd give it less than one star if I could. First, it doesn't seem to have any up-to-date coupon codes. It also has this annoying little popup window that I can't close. After removing the add-on, the pop-up was still there, and had to manually remove the app by deleting the code. Now I have a blank pop-up that won't go away. I'm still waiting for Mozilla to respond to my inquiry for help.